Los Angeles -LRB- CNN -RRB- -- Michael Jackson 's nephew testified Thursday that he believes his uncle was murdered .

T.J. Jackson , the youngest son of Jackson brother Tito , revealed his suspicion while being cross examined by an AEG Live lawyer in the Michael Jackson wrongful death trial .

Jurors also heard him testify about the emotional devastation caused by Michael Jackson 's death .

`` He was just everything , '' said T.J. Jackson , who shares guardianship of Michael Jackson 's children -- Prince , Paris and Blanket -- with their grandmother .

Michael Jackson 's mother and his children contend his last concert promoter was liable for his death because it hired , retained or supervised Dr. Conrad Murray , who was convicted of involuntary manslaughter .

AEG Live lawyers argue it was Jackson , not the company , who chose and controlled Dr. Murray . Their executives had no way of knowing he was giving nightly infusions of the surgical anesthetic propofol to Jackson , which the coroner ruled killed the singer , the lawyers say .

`` Do you believe your uncle was murdered ? '' AEG Live attorney Jessica Stebbins Bina asked T.J. Jackson .

`` I do , '' he answered . `` I believe it because he did tell me and the brothers that he was going to be murdered on a couple of occasions .

`` He said that just because of his position he was a target . ''

T.J. Jackson had earlier testified that his mother , Delores Jackson , was the victim of murder 19 years ago .

`` My mother was murdered for money , too , so I do n't put that past anyone , '' he said .

Initially it was believed that his mother , Delores Martes Jackson , who had divorced from Tito Jackson in 1993 , drowned in a swimming pool , but the case was reopened , and her sons in 1995 filed a wrongful-death lawsuit against a man they accused of killing her . Three years later , the man was convicted of second-degree murder and sentenced to 15 years to life in prison .

If the jury concludes AEG Live has liability in Jackson 's death , then they must put a dollar figure on damages -- including the emotional toll on the children caused by the loss of their father .

The oldest child , 16-year-old Prince , testified Wednesday that sister Paris , 15 , `` was probably hit the hardest because she was my dad 's princess . ''

Paris has been hospitalized since a suicide attempt earlier this month , although it is unclear whether jurors will know about it .

`` The loss of my uncle has hit her at a different level and she 's in a tough spot , but we 're loving her and doing everything we can , '' T.J. Jackson testified Thursday

He said he was at a loss for words to describe what Paris is going through . `` It 's tough , you know , it 's tough . ''

`` She was daddy 's girl , '' he said . `` My uncle was her world . My uncle gave them more love and for it to be taken away , it 's been very hard for Paris , and for all of them . ''

Blanket , who was 7 when his father died , `` was always wrapped around his leg , very shy , '' T.J. Jackson said . `` Wherever my uncle was , Blanket was a foot away , My uncle was everything to Blanket . ''

`` Right now , I do n't know if Blanket realizes what he lost , '' Prince said . `` He was so young . He is still growing up just like I am and he does n't have a father to guide him . ''

Prince said he has `` a hard time sleeping '' since his father 's death in 2009 . It left him `` emotionally distant from a lot of people '' for a while , he said .

He 's missed sharing with his father `` the first day of going to school , having the first girlfriend , being able to drive , '' Prince testified .

T.J. Jackson said Prince was Michael Jackson 's `` little assistant . ''

`` He was very mature for his age , very smart . My uncle would prepare him for things '' by telling him about his business deals .

`` He 's very strong , he 's very smart , '' he testified . `` He was always the smartest kid I 'd ever known . ''

As a guardian , T.J. Jackson said he must constantly deal with paparazzi stalking the children for photographs .

`` It 's , just to be frank , a complete annoyance , '' he said . `` It 's awful . ''

He suggested there should be a new law to protect celebrity children from photographers .

`` I know it 's making everything harder for the kids to grieve and to recover and to progress , '' he said .

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NEW : `` My mother was murdered for money ... I do n't put that past anyone , '' T.J. Jackson says

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T.J. Jackson shares guardianship of Prince , Paris and Blanket with their grandmother

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Paris `` in a tough spot , but we 're loving her and doing everything we can , '' T.J Jackson says

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Paparazzi stalking makes `` everything harder for the kids to grieve and to recover , he says